Newbie looking for some help

My Room:  Cathedral ceiling (approx 20 feet) approx 16 deep by 32 long.  Speakers must be placed facing in the direction of the shorter distance.  They are positioned in about half the length.  The rectangle comprises the family room on one half and the kitchen on the other half separated by a half wall.  The system and speakers are in the family room half.  The distance from the front of the speakers to my ears is about 10 to 12 feet.

The Equipment:  VTL 150 amp, VTL 2.5 pre amp, Pro-Ject classic turntable, Sabrina X speakers.  A Pro-Ject DAC and music streamer.  In order to fill the space playing vinyl I have to turn the volume up to 50 to 66%.  But that gives me ear fatigue fairly quickly.  This equipment can be exchanged or returned at this point. My dealer believes the problem can be solved with stepping up to the VTL 200-S.  I will try that but I was also thinking that I want to try the Martin Logan 15's that I heard at another store that had them set up in a giant high ceilinged room and they sounded awesome. I want a sweet, acoustic balance spacious sound.  I thought I got that from the electrostatic speakers more so then what I have heard from the Wilson audio speakers.

The room is less than ideal for sure.  Any advice?